Question

利用数组定义两个3*3矩阵，计算这2个矩阵的乘积，并将计算结果存放到另外一个二维数组中！

Answer 1

void f(double a[3][3],double b[3][3],double c[3][3])
{
int i,j,k;
double t;
for (i=0;i<3;i++)
for (j=0;j<3;j++)
{
for (k=0,t=0;k<3;k++)
t+=a[i][k]*b[k][j];
c[i][j]=t;
}
}

void main()
{
int i,j;
double a[3][3]={{1,2,3},{4,5,6},{7,8,9}};
double b[3][3]={{1,4,3},{4,5,5},{7,8,9}};
double c[3][3];
f(a,b,c);
for (i=0;i<3;i++){
for (j=0;j<3;j++) printf("%10.2lf ", c[i][j]);
printf("\n");
}
}